Improvement in valves



that@ ,Strut tutti (time GEORGE MURRAY, JR., OF OAMBRIDGEPORT, MASSACHUSETTS, ASSIGNOR TO HIM- S'ELF, GEORGE MURRAY, SRL, AND HENRY E. SNOW, OF SAME PLAGE.

Letters Patent. No. 111,373, dated January 31, 1871.

iMPRovEMEN-r IN'vALvEs.

To all whom it may concern Bei itknown that I, GEORGE MURRAY, Jr., of Gambiidgeport, in the co-unty of Middlesex and in the State of Massachusetts, have invented certain new and useful Improvements', in Valves.; and do hereby declare that the following is a full, clear, and

.exact description thereof, reference being had to the The nature of the invention 'relates to improvements in sliding valves, for the purpose'ot" making then'l more durable and effective, as well as cheaper in first cost, and consists in the combination of a valve of peculiar construction with sheet-copper guides, in which the valve traverses; in the means employed-iu' l'operating the valve, and in the` combination andarrangement ofthe principal operative parts of the whole device, all as more fully hereinafter described.

In the drawing-fl Arepresents the valve-box or case, having lateral branches A and A and vertical branches A.

:The branches A and A" are cylindrical in form `within and without, having polygonal faces on'the outside, near each end, and a central opening, c, while the branch A is lozengefshaped on 'a cross-section within and without, having a central opening, b, and extending both above and below the lateral branches, with its shortest diameter on the line'of the lateral .branches lengthwise.

Thetop of the branch A is surmounted with a' cylindrical cup-shaped plate, c, the edges of which are provided with screw-threads upon the outsides, while the branches A' and A" are threaded upon their iusides, near the respective ends. The parts thusdescribed are all cast in one piece, oi suitable metal.

Within the openings a in .the lateral' branches the valve-seats B, which areannnlar in form, are arranged in such a manner that the inner faces, which are 1ozenge-shaped project a little into the openings b in the l branch A, and correspond in all parts with the lozenge form of this opening.

The ends b' of the openings b are provided with V- shaped sheet-copper guides C, extending vertically near the whole length of said opening.

A polygonal cap, D, having a neck, d, extending vertically above its center, screws down upon the plate c, and is provided with -a central opening, e, extending through-the cap and neck, having screw-threads upon it, which engage with corresponding screw-threads upon the spindle E.

The outer upper portion of the neck d is in turn provided with screw-threads, which fit corresponding 'screw-threads in the stuljng-box F which lcovers it. This stu'ing-box has a central opening in its top of a size suicient for the spindle to pass through it.

The valve Gis elliptic in form upon a front view, ahdlozenge-shaped upon an end view, and1 provided with wings f upon its sides; lit tapers regularly and slightly upon all sides from top t0 bottom, and has a central opening, y, from top tobottom provided with screw-threads which engage with corresponding screwthreads upon the foot of the spindle;

The spindle E has right-hand screw-threads upon its upper portion'where it'engages with the cap D, and left-hand threads where it engages with the valve G, and is surmounted with a proper hand-wheel, H.

In operation, by turning of the handlwheel to the right the spindle is depressed in `the cap, and at the same time, by-its left-hand screw-threads, it depresses the valve in its seats, while 'by a reverse motion the valve is elevated in the same way, thus increasing the speed of movement, and saving material in the spindle, in the valve-box, and in the cap.

In' the operation of depressing the valve it wedges itself into the valve-seats lmore and more rmly, as force is applied, until the valve closes the opening in the valvel tightly. The valve-seats are cast, of suitable composition, in iron molds, and are afterward iinished under the hammer, which gives the advantage of great hardness and consequent durability and a more accurate proportion.

The valves are cast of suitable composition and hh- .ished up in the way above described, and in use, as they become worn, may be reduced a little in length by. filing olf from the bottom, which will enable them to it as closely as before. The advantage of the lozenge-shapedform of the valve lies in its cheapness, taking but little metal; in its ability to prevent several wedging surfaces, by which it is held iirmly in position without the danger of binding orsticking in the seats, while its wings have a certain freedom of motion in 'the guides.

The advantage of the copper' guides lies in the smoothness of the bearing which they give against the outsides of the wings and 'the edges of the valve proper, whichpress upon the outsides of said guides, and in .the protection given in casting, hereinafter described.

In the construction of this valve I. take the valveseats, made as above mentioned, place the valve in position between them, and the copper guides in place at the sides, covering the outer edges of the wings,

substantially as described and shown, for the purposev set forth. l

2. -The combination of the spindle E provided with right and left-hand screws, screws, the Yecp D provided with right-hand female-screw, and the valve Gr provided with left-hand female-screw, all constructed, :irrauged, and operated substantially as described and shown, for the purposes set forth.

3. The combination ofthe case A, the valve-seats B, the valve G, the guides G, the cap D, the spindle E, the stufing-box F, and the-,handwheel H, all c011- structed, arranged, and operated substantially asdescribed and shown, for the purposes set forth.

In testimony that I clnim the foregoing I'have hereunto set my hand and seal this day of December,

V'GEORGE MURRAY, JR. [1.. s] Witnesses:

WILLIAM DAvIs, J. W. HAMMOND. 

